How to I get themes on Firefox when the button isn't there?

I've been trying to change my theme on firefox from default and i go to Tools-%26gt;Add-ons-%26gt; Themes, but all i see is that there is a ';Default 3.0.6'; but i cant click on the ';Uninstall'; button or the ';Use Theme'; button and there is no box in the bottom corner saying ';Get Themes';. Can someone please help?How to I get themes on Firefox when the button isn't there?
Themes are considered Add-ons. You must download them in order to use them. You can do so by going to:



https://addons.mozilla.org/en-US/firefox



You can then go to THEMES and look through the different themes. Once you have found one you want, click ADD TO FIREFOX. It will download and then it should be in TOOLS%26gt;ADD-ONS and you can change the theme whenever.